Widespan Membrane Roof Structures 181 指 Fig.11.3D Renderings connections.The location of the pressure taps has been chosen to cover the whole roofing surface according to the Fig.13,which shows also the influence area of each pressure tap.These areas have been obtained performing a triangulation among the pressure taps and linking together the barycentres of the identified triangles. In the above figure the positions of the pressure taps are shown together with their influence areas;each position identifies the position of both the tap at the intrados and the tap at the extrados,which lay on the same vertical and are spaced out by the thickness of the box structure of the roofing. The pressure measurements have been performed using piezoelectric transducers linked to the pressure taps through Teflon pipes (Fig.14).Widespan Membrane Roof Structures 181 Fig. 11. 3D Renderings connections. The location of the pressure taps has been chosen to cover the whole roofing surface according to the Fig. 13, which shows also the influence area of each pressure tap. These areas have been obtained performing a triangulation among the pressure taps and linking together the barycentres of the identified triangles. In the above figure the positions of the pressure taps are shown together with their influence areas; each position identifies the position of both the tap at the intrados and the tap at the extrados, which lay on the same vertical and are spaced out by the thickness of the box structure of the roofing. The pressure measurements have been performed using piezoelectric transducers linked to the pressure taps through Teflon pipes (Fig. 14)